A Court of Silver Flames is a very spicy book. Its genre is New Adult, and this is mostly because of the graphic sex scenes. Almost the entire ‘Court of” series by Sarah J. Maas is NA because of this. And every new book seems to have more spice than the previous one. Do keep in mind that most of these scenes fit the story well and aren’t trashy.
The Barnes & Nobles edition of this book contains a Feyre bonus chapter. In this chapter Feyre and Rhysand discuss the baby and decide on a name for the little boy. There is also another version of the book with an Azriel bonus chapter. It continues after the end of the book. Azriel is feeling a bit jealous of Rhys and Cassian for having found their mates. And when he sees Elain, he again realizes how much he wants her.